Overview
The ZF 4657.162.401 PRESSURE REGULATOR is a critical hydraulic control component engineered specifically for the WG210 series transmission. This OEM genuine part precisely modulates hydraulic pressure within the valve body assembly, ensuring consistent clutch engagement and smooth gear transitions. The SKU 4657.162.401 sits directly within the main control circuit, acting as a gatekeeper for oil flow to the shift elements. When functioning correctly, it maintains the exact pressure needed for torque converter lock-up and planetary gearset operation. This regulator works in concert with the TRANSMISSION HOUSING and the HOUS.FRONT SECT to create a sealed hydraulic environment.
Symptoms of Failure
- Erratic shift timing and gear slipping – A worn 4657.162.401 causes inconsistent line pressure, leading to delayed engagement or sudden slipping between gears, especially under load.
- Torque converter shudder at low speeds – When the pressure regulator fails to maintain steady lock-up pressure, drivers experience a pronounced vibration during acceleration from a stop.
- Hydraulic oil leaks near the valve body – Deteriorated sealing surfaces on this part allow transmission fluid to escape, often pooling around the HOUSING REAR PART interface.
- Harsh reverse engagement – A sticking regulator spool causes sudden pressure spikes, resulting in jarring shifts when selecting reverse gear.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.162.401 |
| OEM Reference | ZF 4657.162.401 |
| Material | Hardened steel with zinc-nickel coating |
| Weight | 0.28 kg (0.62 lbs) |
| Length | 68 mm |
| Outer Diameter | 22 mm |
| Seal Type | Integrated O-ring groove |
| Operating Pressure Range | 8–22 bar |
Compatibility
This pressure regulator is primarily designed for the ZF WG210 series, but it also fits the WG180, WG200, and WG220 transmission families. It is compatible with both off-highway and industrial vehicle applications where ZF powershift transmissions are used. The 4657.162.401 replaces earlier variants in the WG200 series and is backward-compatible with certain WG150 models when used with the correct CYLINDRICAL PIN alignment kit.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101042 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4657201028 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4657201013 | HOUSING REAR PART | Rear casing supporting output components |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636100801 | CAP SCREW | Fastener for valve body retention |
| 4656301148 | FIXING PLATE | Secures regulator in valve body bore |
| 4657301034 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4657301035 | SCREEN SHEET | Coarse mesh pre-filter for oil circuit |
| 0636100803 | CAP SCREW | Bolt for rear housing attachment |
| 4656301048 | OIL FEED.HOUSG. | Oil supply channel housing |
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